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“As time evolves so does DNA science so we have carried out further familial DNA screening and are keeping an open mind about where this will lead the investigation.”

Detective Chief Superintendent Murray said he believes anyone with information about who killed Inga Maria owes it her family to come forward.

Inga Maria Hauser (Image: PSNI/PA Wire)

“Inga Maria’s family deserve to know what happened,” he added.

“Her father died not knowing who killed his daughter and her mother has been ill for many years.

“The family have been tortured by her murder and we have been in close contact with Inga’s heartbroken sister in the run up to this anniversary. Do the decent thing for Inga’s sister and mother.

“Her last notebook entry on April 6 reads: ‘Went from Glasgow to Ayr and from there to Stranraer to get over to Ireland. Saw the sea. Beautiful and mysterious. Wonder where I stay tonight. Need more money.’"

Sadly, Inga’s final resting place in Northern Ireland was in Ballypatrick Forest.

Detective Superintendent Raymond Murray with a map of the area (Image: Paul Faith/PA Wire)

Det Supt Murray said: “I cannot rule out the possibility that more than one person was involved in Inga Maria’s death.

"I also have a report that a man in the rural area east of Ballymoney was seen soon after the murder in April 1988 with scratches on his face and that there was concern in the community that he had some sort of involvement.

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“I am making a direct appeal to the family and friends of the murderer or murderers to come forward. Thirty years has passed and in that time we have to ask not only what impact this murderer has had on the Hausers but what impact has he had on his own family. How has it affected them?

"If you are a family member who has information or who even assisted the killer or killers in the aftermath of the incident, search your conscience as now is the time that common humanity should override misplaced loyalty.

“Give us the information we need. What if this was your daughter or granddaughter – subjected to a brutal and ruthless assault after arriving in a new country before being killed and left in a forest?

“Think of the fear and pain she felt, think of her family not having justice.

“After 30 years, it’s time to tell us what you know - contact police by calling detectives in Maydown on 02871 379783.”